Process of making hinges



no. 625,443. Patented May 23, I899;- c. GLOVEB.

PROCESS OF MAKING HINGES.

' (Application filed. June 17, 1898.)

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I "ATTORNEY UNITED STATES PATENT OFFICE.

CHARLES CLOVER, OF NEW BRITAIN, CONNECTICUT, ASSIGNOR TO THE P. 85 F. CORBIN, OF CONNECTICUT.

PROCESS OF MAKING HINGES.

SFEGIFIOATION forming part of Letters Patent No. 625,443, dated May 23, 1899.

Application filed June 17, 1898.

To a whom it may concern.-

Be it known that 1, CHARLES GLOVER, a citizen of the United States, residing at New Britain, county of Hartford, and State of Connecticut, have invented certain new and use-, ful Improvements in Hinges and Process of Making Same, of which the following is a full, clear, and exact description.

My invention relates to the art of hingemaking; and my special object is to form the knuckle of a wrought-metal hinge in a way and by a process that will produce aknuckle which shall be without a joint and which shall have great toughness. Other advantages will also appear.

. Heretofore the knuckles of wrought-metal hinges have usually been made of a turnedover portion of the plate of the hinge or have been formed in some other unsatisfactory manner; but in all the constructions I have been acquainted with heretofore the knuckle has been weak. If it is formed of the plate turned over, the resulting joint makes the whole hinge structurally weak, and even if formed otherwise the knuckle has not been sufficiently strong. In myconstruction, however, the material to form the knuckle is upset and compressed into the desired shape and is then bored out, and the resulting knuckle is therefore tougher and the Whole hinge much stronger than in any of the constructions above referred to.

In the preferred embodiment of my invention, Figure 1 shows a cross-sectional view of a plate from which the preferred form of my hinge is made. Fig. 2 shows the parts of the hinge cut out of said plate before the knuckle is formed. Fig. 3 shows an end view of the parts of the hinge shown in Fig. 2. Fig. 4 shows said parts of the hinge after they have been struck in the first die toform the knuckle. Fig. 5 shows an end view of the same. Fig. 6 shows the same parts of the hinge with the knuckle completely formed. Fig. 7 shows an end view of the same. Fig. 8 shows the completed hinge assembled ready for use.

Ashows an end view of the preferred form Serial No. 683,722. (No model.)

of plate from which my hinge is to be formed. This plate is thicker in the middle than at the ends.

B and C are leaves made from this plate, as shown in Fig. 2. The leaf B has projections 1) b and the leaf C projections c, which are to be formed into the completed knuckles. The said parts are put separately into dies and struck upon the edge to upset and compress the said projections into the form of a rounded knuckle, as shown in Figs. 6 and 7. Of course this may be done by one or more dies; but I prefer to employ more than one. This hammering in the dies to which the proj ections are subjected crushes them down and compresses the metal of which they are composed, and consequently makes the knuckle tougher. It results in a knuckle which is integralthat is, without any j ointas the metal is not turned over, and consequently not liable to pull apart. The increased toughness of the metal makes the hinge extremely strong, and as a consequence of this process a hinge is produced which has a knuckle which is of increased tenacity and which will resist the strain caused by the weight of a door to a much greater extent than any of the hinges heretofore constructed. These functions, which are present in a hinge made according to this process, all result from the use of my process in forming the knuckle, and any knuckle previously known does not contain the advantages which a knuckle made by my process possesses.

Of course it is not necessary that the knuckle for myhiuge should be formed byadropdie. It will be obvious that the upsetting and compressing of the metal is the principal thing, and it makes no difference whether this is done by striking a blow upon the metal or by slowly exerting a force upon it, as in a hydraulic press.

What I claim is- The process of forming a knuckle of a hinge without a joint which consists inplacing a plate of metal in a die leavinga straight portion of one edge thereof projecting therefrom, and bulging outward on each side the part of Signed at New Britain this 15th day of June, 1898. V

CHARLES GLOVER.

Witnesses:

W. S. PETERSON, G. E. CHRIST. 

